Alright, let's work through 3900 times 839 step by step
3900 × 839 = 839 × (3900)
+ 839 × 0 which equals 0
+ 839 × 00 resulting in 0
+ 839 × 900 that equals 755100
+ 839 × 3000 resulting in 2517000

= 3272100
